The Line Substitution Solution (S09E23) is the twenty-third episode of season nine of "The Big ... MoreThe Line Substitution Solution (S09E23) is the twenty-third episode of season nine of "The Big Bang Theory" released on Thu May 05, 2016. Over 22,279 TV Time users rated it a 7.76/10 with their favorite characters being Kaley Cuoco as Penny, Jim Parsons as Sheldon Cooper and Kevin Sussman as Stuart Bloom.

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-Sheldon: Kardashian.
-Penny: More specific?
-Sheldon: Khloé?
-Penny: Yees!
-Sheldon: See? I remember because if it looks like Kim, it's Kim. If it looks kinda like Kim, it's Kourtney. And if it looks nothing like Kim, it's Khloé.

Penny watching Sheldon's card:

-Penny: Oh, that's a Venn diagram. And I remember because I thought to myself: "Venn is he gonna stop talking about this diagram".